Prometheus Metrics 端点正在运行，但目标状态为 down

Question

我在 http://localhost:9615/metrics 上运行 Prometheus Polkadot 指标端点 我已经在配置 prometheus.yml 中定义了

global:
  scrape_interval: 15s
  evaluation_interval: 15s

rule_files:
  # - "first.rules"
  # - "second.rules"

scrape_configs:
  - job_name: "prometheus"
    scrape_interval: 5s
    static_configs:
      - targets: ["localhost:9090"]
  - job_name: "substrate_node"
    scrape_interval: 5s
    static_configs:
      - targets: ["localhost:9615"]

我在目标中遇到以下错误

Get "http://localhost:9615/metrics": dial tcp 127.0.0.1:9615: connect: connection refused

我的 Prometheus 正在 Docker 容器内运行

docker run -d --name prometheus -p 9090:9090 -v prometheus.yml:/etc/prometheus/prometheus.yml prom/prometheus --config.file=/etc/prometheus/prometheus.yml

如何解决该错误？

Answer 1

为了在两个容器之间进行通信，您需要它们位于同一个 Docker 桥接网络中。否则，一个容器的 localhost 版本与另一个容器完全隔离。

要解决此问题，请尝试使用容器名称而不是 localhost 在同一个 docker-compose.yaml 中运行两个容器。

By default Compose sets up a single network for your app. Each container for a service joins the default network and is both reachable by other containers on that network, and discoverable by them at a hostname identical to the container name.

version: '2'

services:
  polkadot:
    container_name: polkadot
    image: parity/polkadot
    ports:
      - 30333:30333 # p2p port
      - 9933:9933 # rpc port
      - 9944:9944 # ws port
      - 9615:9615
    command: [
      "--name", "PolkaDocker",
      "--ws-external",
      "--rpc-external",
      "--rpc-cors", "all",
      "--prometheus-external"
    ]

  prometheus:
    container_name: prometheus
    image: prom/prometheus
    ports:
      - 9090:9090
    volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yml
    command: [
      "--config.file=/etc/prometheus/prometheus.yml"
    ]

同样，您需要更新您在 prometheus 配置中点击的主机，如下所示:

global:
  scrape_interval: 15s
  evaluation_interval: 15s

rule_files:
  # - "first.rules"
  # - "second.rules"

scrape_configs:
  - job_name: "prometheus"
    scrape_interval: 5s
    static_configs:
      - targets: ["prometheus:9090"] # NOTE HOW ITS NOT LOCALHOST HERE
  - job_name: "substrate_node"
    scrape_interval: 5s
    static_configs:
      - targets: ["polkadot:9615"] # NOTE HOW ITS NOT LOCALHOST HERE

您可以在他们的文档 here 中找到有关 Docker 网络复杂性的大量资源。 。但是上面的配置应该可以让你启动并运行，因为这两个目标都出现在我的 Prometheus 中。